Supports AES/EBU, IEC60958, and S/PDIF digital audio standards. Fully supports 5.1 and 7.1 channel audio output. Compatible with 5.1 speaker systems. Sampling rates up to 48 kHz (32 kHz, 44.1 kHz, and 48 kHz supported for digital recording). Fiber optic output supports 48 kHz sampling rate only; DTS-CD at 44.1 kHz requires sample rate conversion for playback. Compatible with Windows 98/ME/2000/XP/Vista/7/8 and Mac OS 9.1 (stereo output only on Mac). Full-duplex playback and recording without requiring an internal PC sound card. USB 2.0 interface, backward compatible with USB 1.1. Complies with USB Device Specification v1.0 and supports full-speed data transfer up to 12 Mbps. Features three input terminals (including one fiber optic input) and three output terminals (including one fiber optic output). Output configuration: 5.1 channels plus S/PDIF optical output. Designed for use with PC, external amplifier, and 5.1 speaker system. Ideal for home theater PCs (HTPC), movie viewing, gaming, and karaoke applications. Can be used with standard headphones for voice chat and online karaoke. Delivers authentic AC-3 or DTS surround sound when connected to a compatible digital home theater system or 5.1 active speaker. Package includes 1 sound card.